I am considering just making the pump have to push the water higher into a shoot of sorts, but my first attempt at this failed. While i go make a taller chute i thought i would submit my dilemma to you guys.

other things i have considered and would be interested in feedback:

Some kind of dial so i could easily adjust power to pump, and thus flow. this would be nice for fine tuning

a sensor/switch that would know when water is flowing through the bell siphon and would shut pump off

a timer connected to the pump, adjusted to the fill cycle so that it shuts off. My main problems with this is that it would have to go on and off like every two minutes since that pump fills the bed so fast

exchange pump for smaller one. Only i can't find the recipt and i have almost no money to get one out of pocket

as /u/CarbonWeAre mentioned, the easist thing to do is to use a valve to modulate the flow from the pump. Rather than just installing a valve between pump and bed, I would recommend recirculating the water that does not go to the bed back to your tank. This will be easier on your pump and provide a little extra aeration.

You can accomplish this with a Tee fitting, a valve, and some tubing. From the Tee, one tube will go to your bed, and the other will go back to your tank. Install the valve on the tube the goes back to your tank. Use the valve to modulate the recirculating flow until your siphon works properly and leave it set like that. Too much flow and your siphon won't stop. Too little flow and it will never start. I've found that there is a pretty small window of flow that my siphon will work with. Yours may be the same.

A better way (to not waste pump power/efficiency) is to take the Pipe going to your grow bed and split it via a T joint right before it's at the bed. Send one of the T lines directly into the bed and with the other, put a valve on it. Choke the valve until a desired flow and have it fall into your tank. This way instead of just choking your pump, you're instead feeding some of it back to the take to aid in the aeration.

(And of course before I hit submit I see mangletron has a similar solution)

I had the same type problem. I traced it out and when the syphon would break the water inside the bell housing would fall back into the planter box causing the water level inside the planter to clog the syphon not allowing it to completely break. my fix was to put a smaller bell syphon in.

Nice. Yeah I have a properly sized one the university of Hawaii has a great PDF where they've done the calculations and have a table I used to size mine. The valve has worked like a charm so far but somebody had a link to a very clever YouTube video where they employed a float that cut of water to the snorkel.im on my phone so if you respond I'll send you the links.

This may also be an instance of your siphon not properly breaking. I would consider a large hole or slit in order to break the siphon. I had a similar problem when I drill small circular holes, the pump would keep the siphon rolling indefinitely.